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Old 10-09-2008, 12:24 PM   #21
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RE: Oil-Bypass-System

When I bought my boat, the PO had used straight 30 (rotella) for the Lehman 135, velvet drive tranny and Westerbeke genset. Just to complicate things, I kept the 30 for the genset, switched to 40 wt for the Lehman, and Transmission fluid for the tranny. Also switched to Chevron Delo 400 since it's a lot easier to find around here. I'm in the Galveston bay area, hence the 40 wt. for the Lehman. However, they all seemed happy with the 30 wt. oil the PO used.
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Old 01-27-2009, 05:22 PM   #22
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RE: Oil-Bypass-System

i have a gulfcoast bypass oil filter for my main, and send in oil samples abt every 400 hrs...if the oil is ok, then i change the roll of bounty 6" paper towels, add abt 3 qts, *and go another 400 hrs...for my genset, i use amsoil marine 15/40 synthetic, and change it every 2 yrs...with synthetic, i usually go double the recomended hrs for changing...they(gulfcoast filters)*filter down to abt 1 micron...normal screw on type oil filters are rated at 28 to 30 microns...i also use the gcf fuel filter...nothing gets thru it! have been using them for abt 12 yrs...no problems...oil sampling saves a lot of oil! oil does`nt wear out, it just gets contaminated...and the gfc filters clean it...amsoil also sells the oil sample kits...to change oil every 50/100 hrs is a waste of good oil...send in a sample, and see what`s in it...ask the lab to explain all the particulates in the oil, etc...clyde
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Old 01-27-2009, 09:41 PM   #23
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RE: Oil-Bypass-System

Marin,

*** Your Northern Lights friend has his head in the sand again. Synthetic oil is better than dino oil period. The only downside is the expense. Would I use synthetic oil on my boat .. hell no. Its stupid in that the advantages of SO can't be realized because we don't work it hard enough. The gremilin in your engine on your boat is carbon, and synthetic oil offers no advantage in dealing with it. Carbon causes wear and the only way to get rid of it is to change oil, so my philosophy is to use dino oil and change it often .. a better way to throw money at your lube oil performance is to change oil 3 times as often and the filter every 3rd change.
*** All the viscosity improvers in your oil ( and most of the other aditives ) take space that could be taken with oil. I belive the lubricity of oil is supperior w single wt and engines last longer with higher viscosity oil. I once worked in a diesel powerhouse ( 1440hp Enterprise ) and it took all day to warm the engine and the oil with electric heaters before the engine was started. I use 15/40 lube oil here in Alaska but if I was in Texas I'd use 40w oil and warm the engine slowly ( a bit ) as in 5 to 8 min to 75% load or 10 min to 90%.* Keep in mind that lube oil tempetures warm much more slowly in most engines than coolant tempetures.
***
Eric Henning
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Old 01-27-2009, 10:51 PM   #24
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RE: Oil-Bypass-System

Quote:
nomadwilly wrote:Marin,


Your Northern Lights friend has his head in the sand again. Synthetic oil is better than dino oil period.*
Eric---

That's not what he said.* He--- and our diesel shop and every marine engine mechanic and specialist I've talked to since buying our boat--- said don't run synthetic oil in OUR engines (1950s era Ford Lehman 120s).* He and the others did not say that conventional oil is better than synthetics.* They use and recommend synthetic or multi-viscosity oils for engines that are designed for them.* They do not use or recommend them for old thumpers from five decades ago.

*
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Old 01-28-2009, 04:46 AM   #25
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Oil-Bypass-System

Most of the research I have seen gives the longest engine service life with single grade oil.

The multi-grade does allow cold starts a bit easier and perhaps 1% or so better mileage from the thin oil being easier to scrape from the cylinder.

With a warm weather boat I would always prefer single grade.

Synthetic has far poorer ability to protect an out of service engine from internal rust , perhaps a poor choice for trawlers with extended non use times.

FF


-- Edited by FF at 05:48, 2009-01-28
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Old 02-03-2009, 05:38 PM   #26
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RE: Oil-Bypass-System

Marin,

If " he " said " don't use SO*"*I think it's clear he is saying it's not as good as the products he advises one to use. My point is that there is nothing bad about using SO except the expense. Why would anyone say don't use it. If he felt as I do he just could have said " it's a waste of money " on a low performance engine or where one dosn't need extreem thermal flexability.

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